Chief - Let me answer some of your questions:
First, diary return.
And from what source is your information? Mine is from COMPLETED DIARIES. I have never seen 540 diaries COMPLETED in the Evansville DMA. Has there been a recent change? This may be the SENT BUT NOT COMPLETED LIST?
I have the Fall 2007 Evansville book right here, that I would be glad to send you a PDF file with this info. There are two geographic area used in Evansville, Metro Survey Area (four counties - Vanderburgh, Posey, Warrick in Indiana and Henderson in Kentucky) and the TSA (Total Survey Area) another 23 counties in Indiana, Illinois and Kentucky. "In Tab" is the Arbitron term for returned, usable diaries.
Persons Sent Diaries MSA 1,679 TSA 2,820
Diaries In Tab MSA 1,049 TSA 1,742
In Tab Diaries by County:
Vanderburgh 586
Warrick 230
Posey 85
Henderson KY 148
Total in Evansville Metro 1,049
In Spring 2006, the furthest I can go back online, the In Tab total was 989.
Again, I would be happy to provide a PDF file with this info.
You can calculate the "Per Person Diary Value" by dividing the total populationin a county or demographic by the number of diaries In Tab in that county or demo.
Vanderburgh County 146,600 pop 586 diaries. PPDV 251. Each diary represents 251 people.
Now, to the question of "additional information" available from Arbitron - You are correct, you can get more info from the "comments" pages of diaries, as well as overall info on buying patterns and product usage. Your post inferred that Arbitron sold the actual list of diary keepers (you referred to the "book pool") for stations to market to directly. From the info that is available from Arbitron, stations can design target lists for direct mail and other marketing as you describe. But Arbitron does not sell mailing lists or addresses. You purchase those from other vendors. ARB info tells you the type of person that has filled out diaries in the past - age, gender, zip codes and other purchase information. They do not tell you WHO has filled out diaries in the past. No addresses or names or phone numbers.
Yes, there are ways to "game" the system. As a programmer and consultant, I've used many of them. I was concerned because your post strongly implied that stations and ARB work as accomplices to manipulate the system, and that is misinformation. (